3x=400-7x

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Solution for 3x=400-7x equation: 



3x=400-7x

We move all terms to the left:

3x-(400-7x)=0

We add all the numbers together, and all the variables

3x-(-7x+400)=0

We get rid of parentheses

3x+7x-400=0

We add all the numbers together, and all the variables

10x-400=0

We move all terms containing x to the left, all other terms to the right

10x=400

x=400/10

x=40

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